source: trunk/examples/graphicsview/diagramscene/diagramitem.cpp@ 846

Last change on this file since 846 was 846, checked in by Dmitry A. Kuminov, 14 years ago

trunk: Merged in qt 4.7.2 sources from branches/vendor/nokia/qt.

File size: 4.7 KB
Line 
1/****************************************************************************
2**
3** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
4** All rights reserved.
5** Contact: Nokia Corporation ([email protected])
6**
7** This file is part of the examples of the Qt Toolkit.
8**
9** $QT_BEGIN_LICENSE:BSD$
10** You may use this file under the terms of the BSD license as follows:
11**
12** "Redistribution and use in source and binary forms, with or without
13** modification, are permitted provided that the following conditions are
14** met:
15** * Redistributions of source code must retain the above copyright
16** notice, this list of conditions and the following disclaimer.
17** * Redistributions in binary form must reproduce the above copyright
18** notice, this list of conditions and the following disclaimer in
19** the documentation and/or other materials provided with the
20** distribution.
21** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
22** the names of its contributors may be used to endorse or promote
23** products derived from this software without specific prior written
24** permission.
25**
26** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
27** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
28** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
29** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
30** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
31** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
32** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
33** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
34** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
35** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
36** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
37** $QT_END_LICENSE$
38**
39****************************************************************************/
40
41#include <QtGui>
42
43#include "diagramitem.h"
44#include "arrow.h"
45
46//! [0]
47DiagramItem::DiagramItem(DiagramType diagramType, QMenu *contextMenu,
48 QGraphicsItem *parent, QGraphicsScene *scene)
49 : QGraphicsPolygonItem(parent, scene)
50{
51 myDiagramType = diagramType;
52 myContextMenu = contextMenu;
53
54 QPainterPath path;
55 switch (myDiagramType) {
56 case StartEnd:
57 path.moveTo(200, 50);
58 path.arcTo(150, 0, 50, 50, 0, 90);
59 path.arcTo(50, 0, 50, 50, 90, 90);
60 path.arcTo(50, 50, 50, 50, 180, 90);
61 path.arcTo(150, 50, 50, 50, 270, 90);
62 path.lineTo(200, 25);
63 myPolygon = path.toFillPolygon();
64 break;
65 case Conditional:
66 myPolygon << QPointF(-100, 0) << QPointF(0, 100)
67 << QPointF(100, 0) << QPointF(0, -100)
68 << QPointF(-100, 0);
69 break;
70 case Step:
71 myPolygon << QPointF(-100, -100) << QPointF(100, -100)
72 << QPointF(100, 100) << QPointF(-100, 100)
73 << QPointF(-100, -100);
74 break;
75 default:
76 myPolygon << QPointF(-120, -80) << QPointF(-70, 80)
77 << QPointF(120, 80) << QPointF(70, -80)
78 << QPointF(-120, -80);
79 break;
80 }
81 setPolygon(myPolygon);
82 setFlag(QGraphicsItem::ItemIsMovable, true);
83 setFlag(QGraphicsItem::ItemIsSelectable, true);
84 setFlag(QGraphicsItem::ItemSendsGeometryChanges, true);
85}
86//! [0]
87
88//! [1]
89void DiagramItem::removeArrow(Arrow *arrow)
90{
91 int index = arrows.indexOf(arrow);
92
93 if (index != -1)
94 arrows.removeAt(index);
95}
96//! [1]
97
98//! [2]
99void DiagramItem::removeArrows()
100{
101 foreach (Arrow *arrow, arrows) {
102 arrow->startItem()->removeArrow(arrow);
103 arrow->endItem()->removeArrow(arrow);
104 scene()->removeItem(arrow);
105 delete arrow;
106 }
107}
108//! [2]
109
110//! [3]
111void DiagramItem::addArrow(Arrow *arrow)
112{
113 arrows.append(arrow);
114}
115//! [3]
116
117//! [4]
118QPixmap DiagramItem::image() const
119{
120 QPixmap pixmap(250, 250);
121 pixmap.fill(Qt::transparent);
122 QPainter painter(&pixmap);
123 painter.setPen(QPen(Qt::black, 8));
124 painter.translate(125, 125);
125 painter.drawPolyline(myPolygon);
126
127 return pixmap;
128}
129//! [4]
130
131//! [5]
132void DiagramItem::contextMenuEvent(QGraphicsSceneContextMenuEvent *event)
133{
134 scene()->clearSelection();
135 setSelected(true);
136 myContextMenu->exec(event->screenPos());
137}
138//! [5]
139
140//! [6]
141QVariant DiagramItem::itemChange(GraphicsItemChange change,
142 const QVariant &value)
143{
144 if (change == QGraphicsItem::ItemPositionChange) {
145 foreach (Arrow *arrow, arrows) {
146 arrow->updatePosition();
147 }
148 }
149
150 return value;
151}
152//! [6]
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